Interspire Product Knowledge Base

Technically, there is no limit to the number or emails which Interspire Email Marketer can send.  When dealing with high volumes of email, the capacity to send has more to do with the configuration of PHP, MySQL and most importantly the MTA (mail trasfer agent).  Most servers use "out of the box" configurations of an MTA (Sendmail, QMail, Postfix, Exim, etc).  We HIGHLY advise that you retain the services of an MTA expert if you intend on using Interspire Email Marketer to send more than 75,000 emails per campaign. Most people in our public forum (http://www.interspire.com/forum/forumdisplay.php?f=162) would be happy to give you any pointers or directions to improve your sending speed.